Fernando Velasco
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    From Bytes to Ideas: Language Modeling with Autoregressive U-Nets

    From Bytes to Ideas: Language Modeling with Autoregressive U-Nets

    A byte-level language modeling proposal where autoregressive U-Nets learn a hierarchical token representation — no tokenizer required.

    llms architecture tokenization
    HELMET: A Fresh Look at Context-Length Evaluation in LLMs

    HELMET: A Fresh Look at Context-Length Evaluation in LLMs

    A benchmark system for evaluating LLMs across long contexts — summarization, long-doc QA, RAG, re-ranking, and generation with citations — beyond synthetic needle-in-a-haystack tests.

    llms long-context evaluation
    Titans: Neural Long-Term Memory for Enhanced Sequence Modeling

    Titans: Neural Long-Term Memory for Enhanced Sequence Modeling

    A paper that proposes test-time learnable long-term memory for LLMs, with a 'Surprise' metric that decides what in the context is worth remembering.

    llms long-context architecture
    CTC Loss: What Makes It So Elegant (and Tricky!)

    CTC Loss: What Makes It So Elegant (and Tricky!)

    A hands-on look at Connectionist Temporal Classification — the soft-alignment loss that powers speech and OCR models, and the humble 'blank' label that makes it work.

    asr ocr deep-learning
    CRNNs: You don't always need a Transformer

    CRNNs: You don't always need a Transformer

    Why Convolutional Recurrent Neural Networks still matter for scene text recognition, handwriting transcription, and speech — even in the VLM era.

    computer-vision ocr deep-learning
    LoRA vs Full Fine-Tuning: A Beautiful Illusion of Equivalence

    LoRA vs Full Fine-Tuning: A Beautiful Illusion of Equivalence

    A critical look at how LoRA fine-tuning actually differs from full fine-tuning — and the 'intruder dimensions' that formalize how LoRA silently forgets part of the pre-training.

    llms fine-tuning peft
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Fernando Velasco
Senior Applied Data Scientist & AI Tech Lead
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